Li Yi, Harris Edouard, Chen Liang, Bao Xiaoyi
Department of Physics, University of Ottawa, 150 Louis Pasteur Street, Ottawa, Ontario K1N 6N5, Canada.
Opt Express. 2010 Apr 12;18(8):8135-43. doi: 10.1364/OE.18.008135.
A novel spectrum differential integration (SDI) method has been proposed and verified in an in-line fiber Mach-Zehnder (MZ) refractive index (RI) sensor using salt solutions. In SDI method, the difference between two interference spectra is determined by pointwise subtraction at each wavelength, followed by integration of the absolute differences along the scan range. Compared with the widely used peak wavelength shift method, the SDI method is more reliable over a wide wavelength range (on the order of 400 nm) and results in higher sensitivity as well as reduced device-dependence. The SDI method can also be utilized with other kinds of modal interferometric sensors.
一种新型的光谱微分积分（SDI）方法已被提出，并在使用盐溶液的在线光纤马赫-曾德尔（MZ）折射率（RI）传感器中得到验证。在SDI方法中，两个干涉光谱之间的差异通过在每个波长处逐点相减来确定，然后沿扫描范围对绝对差值进行积分。与广泛使用的峰值波长偏移方法相比，SDI方法在宽波长范围（约400 nm）内更可靠，灵敏度更高，且对器件的依赖性更低。SDI方法也可用于其他类型的模态干涉传感器。
